/* 导航栏 */
#navone {
    position: relative;
    height: 50px;
    width: 100%;
    background-color: #666666;
}
/* 返回和登录装饰 */
a.back ,span.login {
    font-size: 22px;
    font-weight: 700;
    color: white;
}
/* 单独的登录装饰 */
span.login {
    width: 100px;
    position: absolute;
    left: 50%;
    margin-left: -50px;
    line-height: 50px;
}
a.bi-houses {
    position: absolute;
    margin-top: 8px;
    right: 30px;    
}
a.bi-caret {
    position: absolute;
    left: 30px;
    margin-top: 8px;
}
a.back {
    position: absolute;
    left: 60px;
    margin-top: 8px;
    text-decoration: none;
}
h1 {
    margin-top: 30px;
    text-align: center;
    font-size: 20px;
}
form.login {
    width: 250px;
    margin: 35px auto;
}
.btn-primary {
    display: block;
    margin: 30px auto;
}